Bump postgrex from 0.15.1 to 0.15.4

[dependabot-preview[bot]]

Bumps postgrex from 0.15.1 to 0.15.4.

Changelog

Sourced from postgrex's changelog.

v0.15.4 (2020-05-09)

• Enhancements
  • Fix warnings on Elixir v1.11.0-dev

v0.15.3 (2019-12-11)

• Enhancements

  • Allow dynamic connection configuration with the :configure for notifications
  • Add :auto_reconnect option for notifications
  • Accept listen commands even if the notifications connection is down or yet to first connect

• Bug fixes

  • Encode empty arrays in a mechanism compatible with CockroachDB
  • Cleanly terminate connection started with a socket

v0.15.2 (2019-10-08)

• Enhancements
  • Improve performance of the bootstrap query

Commits

• ebb919e Release v0.15.4
• 93f065b Update README
• f752f5e Fix typo in docs (#503)
• 7016094 Fix warnings on recent Elixir
• 27cb2dc Move docs to module
• 903cb47 Explain the implementation. (#500)
• ac41b28 Typo in documentation (#499)
• 92b996c Remove warnings on with
• 6890154 Release v0.15.3
• c88c49a Update CHANGELOG
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #125.